Yaesu_FC-700_user.pdf

《Yaesu_FC-700_user.pdf》由会员分享，可在线阅读，更多相关《Yaesu_FC-700_user.pdf（11页珍藏版）》请在收音机爱好者资料库上搜索。

1、INSTRUCTION MANUAL FC-7 YAESU MUSEN CO., LTD C.P.O. BOX 1500 TOKYO, JAPAN YAESU FC-700 ANTENNA COUPLER GENERAL The FC-700 is an ultra-compact antenna tuner for th FT-77 transceiver. Designed for opration on th 80 through 10 meter amateur bands (including WARC bands), th FC-700 will provide a 50-ohm

2、load to th transceiver when th feedpoint impdance of th antenna System is within th approximate range of 10 ohms to 250 ohms. The FC-700 includes a built-in SWR and power meter, providing 15 watt and 150 watt scales. Also included is an internai 50-ohm dummy load, which may be selected instead of th

3、 antenna for preliminary coupler adjustments. A THRU position of th bandswitch also allows th antenna to be connected directly to th transceiver, bypassing th tuning circuit. High-quality low-loss components are used throughout th FC-700. The matching function it performs means th transmitter can al

4、ways see th rsistive termination for which it was designed. The inhrent selectivity of th FC-700 matching circuitry helps attenuate harmonies too, thus reducing th chance of harmonic-related TVI or out-of-band missions. Please read this manual in its entirety, so as to drive maximum benefit from you

5、r new FC-700. SPECIFICATIONS Frequency coverage: 3.5 7 10 14 18 21 24.5 28 3.5-4.0 MHz 7.0-7.5 MHz 10.0-10.5 MHz 14.0-14.5 MHz 18.0-18.5 MHz 21.0-21.5 MHz 24.5-25.0 MHz 28.0-29.7 MHz Input impdance: 50 ohms Max. variation in load impdance: approx. 10-250 ohms Insertion loss: 0.5 dB max. Rear panel a

6、ntenna connection: UHF type connecter Dimensions: 238(W)x55(H)x 180(D)mm Weight: 2.0kg SWRcalibration: To5:l SWR Maximum transmitter power: 150WRF50ohms Power meter calibration scales: 15 W, 150W MODIFICATION OF THE FC-700 FOR USE WITH IHE FT-747GX The relay and panel lamp in (he FC-700 require 8 VD

7、C. suppled through th DC8V jack on Ihe rear of th Antenna Tuner. Although it is possible 10 use th FC-700 without modification by supplying 8V. from an external source, th FT-747GX does not offer such voltage. This modification allows th FC-700 to be operated from th DG13.5V outpui jack on th rear p

8、anel of Ihe FT-747GX. so that th FC-700 can be switched on and off with th traneiver. Be sure to change th DC8V label on th FC-700 to DC13.5V after making this modification. Remove th covers from th FC-700. ( 1 ) Referring 10 Figure I. remove th two BLACK wires from th meter lamp terminal, and conne

9、ct th one from th DC8V jack to th solder lug near th mler (th other is not used). (2) Install a 56-ohm. 2-watt resistor between th meter lamp terminal and th solder lug with th BLACK wire. (3) Referring to Figure 2, remove th BLUE wire from th terminal post on th RL Unit. (4) Connect one end of a 10

10、0-ohm, 4-watt resistor to th terminal post. and connecl th BLUE wire to th other end of th resistor. Modification is complte. Replace th covers. relabel ihe DC8V jack DCI3.5V, and connect this jack to th +13.5V jack on th FT-747GX. Install a 56-ohm, 2W Resistor Remove if this procdure improves th SW

11、R, it should be continued by further moving th LOAD control in th same direc- tion, but if th initial change in th LOAD control worsens th SWR, move th LOAD control in th opposite direction. It will be clear to th operator when th LOAD control is being adjusted in th right direction. Refer to Figure

12、 1, where th approximate positions of th BAND, LOAD, and TUNE controls are shown for matching to a 50-ohm load. The internai dummy load is used to preset th controls for th operating frequency. The antenna may then be selected, with final tuning taking only a few seconds. (1) Set up th FT-77 or othe

13、r transceiver for normal opration. Set th DUMMY/ANT switch to DUMMY to slect th built-in dummy load. Reduce th drive control on th transceiver to th minimum, and place th transmitter in th standby condition for th moment. (2) Place th BAND, LOAD, und TUNE ton trois in th positions shown in Figure 1

14、for th frequency nearest that at which th antenna is to be matched. Set th function switches to th FWD, SWR. and 150W positions. Set th SWR SETknob to th 12 oclock position. (3) Make preliminary matching adjustments with as little transmitter power as possible. Place th FT-77 in th transmit conditio

15、n (CW and press PTT), and slowly advance th drive until deflection of th meter needle on th FC-700 is observed. Adjust th SWR SET control to align th meter needle with th SET marking on th meter scale. Now switch th FWD/REV switch to REV for accurate reading of th SWR. (4) Adjust th TUNE control for

16、 minimum SWR. If necessary, adjust th SWR SET control and/or transmitter drive to ensure proper calibration (be certain to check th SWR meter sensitivity with th FWD/REV switch in th FWD position, then switch back to REV). Once th dip has been found using th TUNE control, move th LOAD control a smal

17、l amount in either direction, left or right. Adjust th TUNE control for a dip again, and if th SWR is lowered, move th LOAD control slightly more in th same direction as before. Again dip th TUNE control, and continue this procdure until no further improvement is noted. If th initial direction of ad

18、justment of th LOAD control makes th SWR higher, move th control an equal distance in th opposite direction from th starting point, and dip th TUNE control. Remember to recheck th calibration of th SWR meter to avoid misleading readings. - 6 (5) Once th initial procdure has been followed to yield a

19、near-perfect match, th transmitter may be adjusted for tu 11 power, and th FC-700 LOAD and TUNE controls-may be adjusted to yield zro deflection of th SWR meter. When th SWR meter is not calibrated Witll th SWR SET control. it will not ac- curately read th SWR, but it will indicate minimum reflected

20、 power. Do not exceed th maximum key-down time stipulated for your transmitter, (6) Now set th DUMMY/ANT switch to ANT. Following th technique described above, tune your antenna System so as to secure minimum SWR with th antenna. Always begin tuning at low power, to avoid possible damage to transcei

21、ver or coupler components from unknown impdances. BAND 3.5 7 10 14 18 21 24.5 28 FREQ 3.5 MHz 4.0 MHz 7.0 MHz 7.5 MHz 10.0 MHZ 10.S MHz 14.0 MHz 14.5 MHz 18.0 MHz 18.5 MHz 21.0MHz 21.5MHz 24.5 MHz 25.0 MHz 28.0 MHz 29.7 MHz TUNE 4.5 5.5 6.0 6.0 6.5 7.0 G. 5 7.0 7.5 7.5 7.5 8.0 7.0 7.0 7.0 7.0 LAD 7.

22、0 7.5 7.5 8.0 8.0 8.5 B.3 8.5 9.0 9.0 9.0 9.0 9.0 9.0 8.5 9.0 Figure 1 CM COUPLER UNIT TCio RL UNIT Top View - 7 - NOTES ON ANTENNA MATCHING (1) It is very important that th maximum time limits during tune-up conditions for th transmit ter are not exceeded when th trans- mitter is being used at full

23、 power. (2) Any matching perfbrmed by th FC-700 in th shack will hve no effect on th lOSSeS due to SWR on th coaxial Une between th FC-700 coupler and th antenna. The operator should consult one of th popular antenna handbooks to dtermine whether or not matching between th coaxial line and th antenn

24、a must be per- formed at th antenna. For example, a 100- foot length of RG8A/U coax typically has a loss (with 1:1 SWR between it and antenna) of less than 1 dB at 21 MHz. If this line is operated with a 3:1 SWR due to a low or high antenna impdance, th loss due to SWR will increase roughly 0.5 dB,#

25、n imperceptible dgradation as compared to th 1:1 condition. In this case, attempts to reduce th 3:1 SWR at th antenna end would serve no useful purpose as far as reducing losses in th coax, through matching with th FC-700 would improve th impdance presented to th transmitter output circuitry- Howeve

26、r, if a 500-foot length of th above coax were used instead of oniy ioo feet, somewliat more than 1 dB of loss would occur in th ooflv due to th 3:1 SWR, possibly justifying further matching attempts at tlic untciinu. (3) When using a transceiver such as th FT-77 which has protection for th output tr

27、an- sistors against high SWR, it can be seen that th matching action of th FC-700 will ensure that a 50-ohm load is presented to th output circuitry, thus ensuring full transmitter power. (4) It may be useful for th operator to record in a notebook th proper TUNE and LOAD positions for a particular

28、antenna for quick rfrence. Alternatively, appropriate labels may be fabricated and applied to th FC-700 front panel showing th proper positions of th TUNE and LOAD controls for a particular frequency. JOf FC-70Q CIRCUIT DIAGRAM - 8 - PARTS LIST ! MAIN CHASSIS RELAY UNIT Symbol No. VR01 VC01 VC02 MOI

29、 SOI J01,02 J03 LOI L02 C13 Cil C06 C07,08,10,12 C(J4,5,09 C03 C02 COI C14,15 Part No. J6080070 K90000029 K90000028 M0290020 N0190069 PI 090028 P090093 L0020799B L0020800B K 3 0309 005 K3 0309001 K30309004 K 3 03 09006 K30309011 K30309010 K30309009 K30309008 K13170103 Description POTENTIOMETER VM10A

30、949C-50knB VARIABLE CAPACITOR YB-290, 290pF YB-430, 430pF METER SY-50 DC 200MA SWITCH SRS4.49 RECEPTACLE M-BR-06D X-G9242 INDUCTOR Symbol No. D201 C201 RL201 Part No. C0021240 F0002124 G2090001 K13170473 M1190025 Q5000011 Description P.C.B with Components Printed Circuit Board DIODE 10D1 CAPACITOR R

31、ELAY MR-31 Wrapping terminal C SWITCH A UNIT Symbol No. S301 Part No. C0021250 F0002125 N4090034 Description P.C.B u-ith Components Printed Circuit Board SWITCH SUT31A 3itf&X SWITCH B UNI 1 CAPACITOR Dipped mica IkWV 47pF 75pF 150pF 180pF 300pF 330pF 910pF ISOOpF Ceramic disk 50WV 0.01*jF CM COUPLER

32、 UNIT Symbol No. D101.102 R102 R103.104 C101 Cl 02 VC101 T101 L101 Part No. C0020560 F0002056A G2090038 J01245430 J00245103 K30176471 K13170473 K91000019 L0020301A L1190017 Q5000011 Descnption P.C. Bwiih Components Prined Circuit Boaid DIODE 1SS16 RESISTOR Carbon film I/4WTJ 43 VJ lOkf CAPACITOR Dip

33、ped mica SOWV 470pF Ceramic disk 0.047MF TRIMMER CAPACITOR ECV-1ZW 10 x40, lOpF INDUCTOR FL5H-102K ImH Wrapping terminal C Symbol No. D401 S401 R401 Part No. C0021260 F0002126A G 2090 134 N4090035 J00245561 Description P.C.B With Componenis Printed Circuit Board DIODE LED TLY-205 SWITCH SUT12A RESIS

34、TOR Carbon film 1/4WVJ 560n VR UNIT Symbol No. VR501 VR502 R501 R502 Part No. C0021270 F0002127 J5 1723472 J51723223 J00245102 J00245332 Q5 0000 11 Description P.C.B with Components Printed Circuit Board POTENTIOMETER SR-19R 4.7klB 22kfB RESISTOR Carbon film 1/4WVJ Ik 3.3kl Wrapping terminal C DUMMY LOAD UNIT Symbol No. R601-620 C601 Part No. J20375102 K3130900I Description RESISTOR RSF-5BJ 5W Ik CAPACITOR Mica IkWV lOpF ACCESSOR1ES Symbol No.Part No. T9101220 T9100160A R3054370 Description Connection cable Plastic Foot YAESU v - E8285100 (008X-IS)